| 摘要 |
PURPOSE:To accurately control a load coil current at a high speed by correcting the control amount of a control computer for controlling a load current in accordance with the difference between the current flowed to a unit rectifier and the value produced by dividing the current flowed to polyphase rectifiers by the number of parallel connection rectifiers. CONSTITUTION:A load current is detected by a current detector 7, the output is fed back to a control computer 14, the control amount of a polyphase rectifier is calculated by the computer 14, and a load current is controlled. On the other hand, the outputs of differential current detectors 10-1-10-4 are inputted to corrected value generators 17-1-17-4, and the correcting amounts obtained from the generators are inputted to subtractors 18-1-18-4. The outputs of the subtractors 18-1-18-4 are applied to phase controllers 15-1-15-4 together with the outputs of a transformer 9 for an instrument, and firing pulse of te prescribed phases are outputted from pulse amplifiers 16-1-16-4. |
